Improvement in flasks for vulcanizing rubber plates for setting teeth



N.PETERS. FHGTD LTHOGRAPMER. WASHINGTON n C weitet rabes @anni dimitir.

l `To all whom it may concern eld, in the county of Sangamon, and in theState of marked thereon.:

vided, like,that, into vtwo jaws. The lower jaw of jaw has a detachablelid, which projects, at convenjectious, screws extend into correspondingprojecting ,j screwed down upon the lower metallic jaw, by means of thescrews and projecting .eyes above mentioned,

,There maybe 'the imperceptible difference of one thread of thescrew,between one side or the other,

CYRUS G.'FRENGH, -OF SPRINGFIELD, ILLINOIS.

Letters Patent No. 93,429, lated August 10, 1860.

IMPROVEIVINT IN FLASKS FOR VULCANIZING- RUBBER PLATES FOR SETTING-TESTE.

T119 Schedule referred-to in these-Letters Patent and making peutl ofthe Same.

Be it known that I, Gvnus G. Funken, of Springr Illinois, have inventedan Improvement in Flasks for Vulcanizing Rubber Plates for Setting Teethand do hereby declare that the following is a full, clear, and exactdescription thereof, reference being had to the accompanying drawings,and to the 'let-ters of reference My invention consists in' a new methodfor constructing the flasks for vulcanizing rubber plates for thesetting of teeth, andalso anewvmethod ofcomlectingthe two rings togetherwhich form the flask.

The flask now used by dentists for this purpose is made of hard metal,shaped like the human, and di-Y this ordinary flask lis one piece ofmetal, bottomV and sides, the bottom not being detachable. The upper`ient points, over the upper jaw.. Through these proeyes in themetallicjaw'below.

After the plates, which are to be vulcanized, are pressed into thisflask, so constructed, the upper lid is put on, and that, with the uppermetallic jaw, is

the jawslfitting upon each other like thej jaws in the human mouth whenclosed.

These screws do not always make the pressure ,on

all vpartsA of these metallic jaws even and uniform.

which difference affects the uniformity of theplate, and of course theeveuness ofthe teeth set upon it.

' IoI avoid this difficulty, and secure a uniform pressure upon therubber`- plate to be vulcanized, I construct a ask, as shown in Figure1, with only two pieces of metal, one for the upper and one for thelower jaw, and connect these two together'byvme'ans of metallicspring-strips, with catches on the end, the spring-strips being ofuniform length, or I can connect them by means of. bolts and keys.

I also use a detachedupper lid whenever desired, and attach to it thespring-strips, as is shown'in figs. 1 and 2.

'detachable upper lid with A represents the upper jaw or ring, and B thelower jaw or ring of a ilask 4for vulcanizing rubber plates upon whichto set teeth. C. represents the metal in any desiredway, to vthe outsideof the upper metallic jaw A, and extending downward below said jaw tojust such a distance as to' allow the catch c, on the lower inner end ofsaid jaw, to hook under the lower edge f of a projecting slot, d,extending down the side of the lower jaw B, nearly to the bottomthereof.

Figures 1 and 2 represent the vulcanizing-ask with the spring-istrip Cattached to the detachable lid of the upper jaw or ring A. These figuresalso show the construction of the springs (l and the catch c at thelower end.-

Figures 4 and 5 show the upper jaw or ring A with au undetachable top,and the attachment of the springstrips C to the sides of the same, andalso the rings projections the bolts E are thrust, and made to keep inplace the 'upper ring key G. Figure 8 lshows the A by means of theeye Fand construction of the projecting the aperture for the reception of thebolt E. Y

Now, what I claim as my invention, and desire to secure by LettersPatent, is-

lhe within-described flask, consisting of the rings or sections A and B,secured together by means ot the spring-strips O, substantially asdescribed, and for the purposespeciiied. Also, the spring-strips C,provided with the catches;

or detents c, when 'appliedto the rings or sections A and B, or to saidsections and the detachable cover A@ substantially as shown anddescribed.

In testimony that I claim the foregoing, I have hereunto set lmy hand,this 9th day of J une, 1869.

GYRUS G. FRENCH.

Witnesses v GEO. 0. Mener,x '.lHos. NALE.

n spring -strips, of uniform length, fastened securely and lirmly by theupper partl

